You can put this solution on YOUR website! THE X MID POINT IS (7+3)/2=10/2=5 OR 7-5=2 IS THE X VALUE
THE Y MID POINT IS (-7+3)/2=4/2=2 OR -7+2=-5 IS THE Y VALUE
ANSWER (2,-5) IS THE MID POINT.
THE PROOF IS IN THE PLOTTING OF THESE 2 POINTS, DRAWING A LINE BETWEEN THEM & LOCATING THE MID POINT (2,-5)